Disable buffer modified indicator if buffer content matches content on disk

spec/app/status-bar-spec.coffee

@@ -47,13 +47,24 @@ describe "StatusBar", ->
       expect(statusBar.currentPath.text()).toBe 'sample.txt'
 
   describe "when the associated editor's buffer's content changes", ->
-    it "updates the buffer modified indicator", ->
+    it "enables the buffer modified indicator", ->
       expect(statusBar.bufferModified.text()).toBe ''
-      oldText = buffer.getText()
-      editor.insertText("/")
+      editor.insertText("\n")
+      expect(statusBar.bufferModified.text()).toBe '*'
+      editor.backspace()
+
+  describe "when the buffer content has changed from the content on disk", ->
+    it "disables the buffer modified indicator on save", ->
+      editor.insertText("\n")
+      editor.save()
+      expect(statusBar.bufferModified.text()).toBe ''
+      editor.backspace()
+      editor.save()
+
+    it "disables the buffer modified indicator if the content matches again", ->
+      editor.insertText("\n")
       expect(statusBar.bufferModified.text()).toBe '*'
       editor.backspace()
-      buffer.save()
       expect(statusBar.bufferModified.text()).toBe ''
 
   describe "when the associated editor's cursor position changes", ->

src/app/buffer.coffee

@@ -248,6 +248,9 @@ class Buffer
   isModified: ->
     @modified
 
+  contentDifferentOnDisk: ->
+    fs.read(@file.getPath()) != @getText()
+
   getAnchors: -> new Array(@anchors...)
 
   addAnchor: (options) ->

src/app/status-bar.coffee

@@ -33,7 +33,8 @@ class StatusBar extends View
     @editor.getBuffer().on 'buffer-change', => @updateBufferModifiedText()
 
   updateBufferModifiedText: ->
-    if @editor.getBuffer().isModified()
+    buffer = @editor.getBuffer()
+    if buffer.isModified() and buffer.contentDifferentOnDisk()
       @bufferModified.text('*')
     else
       @bufferModified.text('')